eClean Issue 39

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"Winter 40 Pressure washing during the winter can present some special challenges. Here is a list of some of our top winter pressure washing tips to help you avoid some rookie mistakes. • In calm air, hot water washing can be done to 15 to 25 degrees Fahrenheit. In blowing wind, hot water washing can be done to about 34 degrees Fahrenheit. If possible, wash in direct sunlight to take advantage of thermal heating. • Do not let your washer freeze! • Your washer can still freeze going down the highway with a reported air temperature of 35 degrees Fahrenheit. That is because of the cooler temperatures in low places. Remember that air temperature varies normally two to six degrees in a given region going up and down high and low places. • You can pull open trailer wash rigs with water tanks down the highway in freezing temperatures by putting your wash wand into your 500 gallon water tank, and firing up the water heater and recirculating the water as go down the road. If you are only going a short distance or if the temperature is not very cold (like 15 to 20°F) it may not be necessary to turn on the water heater. In this case this procedure will also work for cold water pressure washers connected to water tanks. • Keep your water supply hoses flowing with water. Water out of the ground will be about 50 degrees Fahrenheit in most areas. If your water supply or high pressure hoses run across the cold ground, they will freeze in a few minutes in sub- zero temperatures. The average ground water summer to winter water temperature variation is about 30°F. Most oil fired high pressure water heaters raise the inlet water temperature 120° to 140°F with the burner running continuously. With the reduction of inlet water temperature in the winter you need to increase your fuel nozzle one or two sizes. Then in the spring you need to change the fuel nozzle again and reduce the fuel nozzle by one or two sizes. • When you are trying to decide if it is safe to wash, you should consider the following: – Is it safe to drive on the roads? – Can you arrive at the job site safely and without the equipment freezing up? – Will you have a safe surface to walk on? Will you be on a roof ? Sidewalk? Ice or Snow? Scaffolding? – Can your employees drive to work OK? – Will the freezing of the waste wash water be a problem? – Can the washing be done safely? – What will other traffic be like and how skilled are other drivers? What are the chances of a traffic accident? • Chemicals work slower in cold weather. Plan on using more chemicals and extra dwell time for the chemicals to work. • Do not let your chemicals freeze. Store in a dry, warm place. Liquid chemicals will usually separate upon freezing. • On days you cannot wash do sales calls and equipment maintenance. These tips were taken from the PowerWash. com blog, a resource for pressure washing industry professionals seeking information about business develpment and equipment advice. For more information, visit Pressure Washing in the Winter by

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